Safety guard for box ending machines



Fb 111, 193$. J. 5 M

' SAFETY GUARD FOR BOX ENDING MACHINES 2 Shets-Sheet 2 Filed Sept. 20,1934 INVENTOR.

iJNiTEfi STATEE PATENT @FFEQE SAFETY GUARD FGR BOX ENDING MACHINESJulius M. Minkow, New York, N. Y.

Application September 20, 1934, Serial No. 744,759

2 Claims.

This invention relates to improvements in safety guards for endingmachines, commonly used in paper box factories, for attaching cardboardends to box forming parts.

Ending machines are constructed so that a vertically reciprocatingmechanism, carrying the incomplete box blank, is moved against an endaflixing head, which has horizontal mechanism for shifting a previouslyglued end in line position for attachment to the incomplete box blank,as it is shifted on a form into engagement with the prepared end. Thevertically moving mechanism or box form operates so that it frequentlyhappens that the marginal, infolded, attaching flaps of the incompletebox blank will open outwardly, and the end will not be fully attached tothe box blank, when the supporting form reaches the limit of its upwardtravel. To avoid defective work the operator is tempted to place hisfingers over the box form, and if his withdrawing movement is delayedthe heavy metal box form will rise against the heavy end affixing head,and sever the fingers which project over the form.

The object of the present invention is to provide a guard, whichcompletely excludes the fingers of the operator from entering betweenthe vertically movable form and the end attaching head above it, whichcan be adjusted to fit standard machines, and varied to protectdifferent sizes of box forms, or different adjustments of the box form,and which will move with the vertically operating form carryingmechanism.

With the above and other objects in view the invention consists incertain new and useful constructions, combinations, and arrangements ofparts, clearly described in the following specification, and fullyillustrated in the accompanying drawings, in which:

Fig. l is a front elevation of the safety guard, mounted in place.

Fig. 2 is a horizontal sectional view through the machine, showing theattachment in top plan, taken on line [-4 of Fig. 1.

Fig. 3 is a vertical sectional view, taken on line 2-2 of Fig. 1.

Fig. 4 is a detail sectional view of the bracket arm and its connectionwith the front guard bar.

Referring to the accompanying drawings, illustrating the practicalconstruction of the invention 5 designates the form carrier, which ismounted to reciprocate vertically within the frame of the machine. Onthe form carrier the box form 6 is mounted. This form may be of thefixed or adjustable type, and in either case various sized boxes aremade upon the form by the ending operation of the machine. The form isshifted vertically by the carrier to bring a box blank mounted on theform into line position with the end affixing head 1. The operation ofthe standard type of machine is such that the end holding edge flaps ofbox blanks, imposed on the form, frequently open up, with the resultthat the ends are imperfectly applied to the box blanks.

To restrain the flaps from opening up, or to restore them toapproximately flap or but slightly angular position, the operator istempted to insert his fingers over the form, while it is in upwardmotion, and if he is not quick enough the form is driven against the endhandling head, and the fingers of the operator are out off, orcompletely crushed.

To avoid such accidents I provide a safety guard, which includes therear supports or uprights 8 and 9, the lower end of which is formed withintegral spaced jaws l 0 and Illa, one of which is equipped with a setscrew l I, whereby the support may be clamped to a horizontal bar l2,mounted on or carried by the form carrier 5.

The upright support 8 is equipped with an integral horizontal bar I 3,and the upright support 9 is equipped with an integral bar l4, which aresupporting in horizontal alignment with each other. The outer ends ofthe bars l3 and I4 are anchored to the form carrier.

On the bar 13 a horizontal bracket bar or arm I5 is mounted, by means ofthe clamp head I6, which includes the thumb nut or screw H, which isadapted to develop pressure against the upper edge of the bar l3. Thisbracket arm extends forwardly toward the loading side of the machine,and is formed with an upwardly offset portion l8, which carries ahorizontal extension l9, terminating in an integral upright arm 20.

On the bar Ma horizontal bracket arm 2|, similar in construction to thebracket arm I5, is mounted in a similar manner, by means of an otherclamping screw ll. On the forward end of the bracket arm 2| an upwardarm 22 is formed. These two bracket arms are supported in similarhorizontal planes for vertical movement with the form carrier, onopposite sides of the form, spaced a sufiicient distance to provideample movement for the form.

On the uprights 20 and 22 the horizontal front guard bar 23 isadjustably mounted, and for this purpose is formed with longitudinalslots 24 and 25, which receive the screw bolts 26 and 21, carried by theshort upright arms 20 and 22.

Winged nuts 28 and 29 are threaded on these screws against thehorizontal bar 23. This guard bar is formed with an upwardly curvedguard flange 30, which extends forwardly under the screws and thumbnuts, so as to protect the hands of the machine operator from injury.

The front guard bar is mounted so that it shifts in front of the endafiixing head of the machine, and thus provides a rising guardingelement adapted to prevent the insertion of a human hand between theform carrying head and the end aflixing head. Insertion of a hand oneither side of the form is prevented by the horizontal guard bracketarms, which support and move vertically in both directions with thefront guard bar 23.

The relation of the side guard bars to the form, and the relation of thefront guard bar to the form, may be adjusted horizontally so that thesafety guard device will operate equally well with differentadjustments, or different sized box forms, and will in every casepositively prevent the operator from inserting his hands between themoving form and the affixing head of the machine.

The guard moves with a form and allows the operator to insert andextract a guard at any time. It allows the operator to clamp the boxagainst the form in a higher position. In case the operator does not setthe guard correctly, there will be no injuries effected.

Having described my invention I claim:

1. A safety guard for box ending machines, consisting of guard bars forguarding the sides of a moving form, a front guard bar adjustable on theside guard bars, and means for adjustably mounting the side guard barson the form carrier of a standard box ending machine.

2. The combination with a box ending machine having a vertically movablepart forming an operating element of the machine, a pair of bracketsclamped in spaced relation to each other on said movable part andprovided with horizontal supporting bars, horizontal guard armsadjustably clamped to the bars and extending forwardly thereof, and afront guard bar clamped to the forward ends of the arms and providedwith a forwardly and upwardly curved member.

JULIUS M. MVINK'OW.

